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1968년 ~ 2024년까지 1,211 건의 한국천문학회지를 격월간 확인하실 수 있습니다.
- The Korean Astronomical Society (The Korean Astronomical Society)
- 계간 (Quarterly)
- ISSN : 1225-4614 (ISSN : 1225-4614)
1225-4614
- DB구축현황 : 1,211건 (DB Construction : 1,211 Articles)
총 게시글 1,211건
페이지 90/122
891
- HUNSTEAD RICHARD W.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.35-38
- 1996
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Much of our knowledge about the formation and evolution of high-redshift galaxies has come from studying the absorption signatures they impress on the spectra of background QSOs. The damped Lyman <TEX>$\alpha$</TEX> (DLA) systems, in particular, have proved to be valuable probes of the metallicity and dust at redshifts z <TEX>$\~$</TEX>2-3 in what are the likely progenitors of galaxies like our own. At z <TEX>$\~$</TEX> 2 we find that the typical metallicity of the universe was 1/15 solar. In addition, we find clear evidence for the existence of trace amounts of interstellar dust in DLA galaxies and show that this is consistent with recent high resolution spectra of DLAs with the Keck telescope, despite claims to the contrary.
892
- KIM SUNGEUN
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.95-95
- 1996
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We present the recent results of an HI aperture synthesis mosaic of the Large Magellanic Cloud(LMC), made by combining data from 1344 separate pointing centers using the Australia Telescope Compact Array(ATCA). The resolution of the mosaiced images is 1'.0 (15 pc, using a distance to the LMC of 50 kpc). In contrast with its appearance at other wavelengths, the LMC is remarkably symmetric in HI on the largest scales, with the bulk of the HI residing in a disk of diameter 7.3 kpc. Outer spiral structure is clearly seen, though the features appear due to differential rotation, therefore transient in nature. A good correlation is seen between the supershells previously identified in Halpha (e.g. Meaburn 1980) and HI structures.
893
- LEE HYUN-CHUL
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.133-134
- 1996
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We present the systematic variations of H<TEX>$\beta$</TEX> index of simple stellar populations due to horizontal-branch (HB) stars. Most of the previous works have been done without careful considerations of HB stars. Since the Balmer line strengths are very sensitive to the temperature, including the HB stars are quite important. We found that the strength of H,6 index is strongly affected by HB stars, and hence the age estimation without careful consideration of the variation of HB morphology with metallicity and age would underestimate the ages of ellipticals.
894
- KIM YONGGI
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.247-248
- 1996
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In order to study the X-ray radiations from solar type strong interacting binary stars, we have collected X-ray data of 44i Bootis (P=0.2678 days, SP=G2+G2) from the EXOSAT data archive. Preliminarly analysis of a part of these data has been already reported by Vilhu & Heise (1986). In this paper, however, we present a more complete light curve in LE region than the previous work, and some unpublished X-ray light curves and spectrums. Using these new materials a new attempt to find the physical explanation about. some observational characteristic figures in the X-ray light curves and spectrums has been made.
895
- XIAO K. C.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.413-414
- 1996
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A 230 GHz SIS tunnel junction receiver has been being developed for radio astronomy in Nagoya University. In this heterodyne receiver, we use a <TEX>$\~$</TEX>1/3 reduced hight rectangular waveguide SIS mixer with two tuning elements as front end. The mixer block with SIS junction was cooled to 4K with a closed cycle He-gas refrigerator. So far, a double sideband receiver noise temperature lower than l00K in 222-237 GHz is obtained. The receiver exhibits a best DSB noise temperature of 69K at 236 GHz as well as 228 GHz.
896
- SUNG HWANKYUNG
- Journal of the Korean astronomical society = 천문학회지
- 29, n.2
- pp.269-278
- 1996
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We present the color-magnitude diagrams (CMD) of more than 24,000 stars in the field of an intermediate age open cluster M11, based on wide field CCD imaging. The morphology of the CMDs varies strikingly as the distance from the center of the cluster increases. From the surface number density analysis, we confirm the mass segregation effect in this cluster: the bright, massive stars are centrally more concetrated than the faint, low mass stars. The slope of the field-corrected surface density with respect to magnitude progressively increases as the radius increases, up to r = 5'. Most of the field stars in or near the cluster main sequence band and in the bright part of the red stars in the CMDs appear to be nearly at the same distance as M11, and they are considered to be the major component of disk stars in the Sagittarius-Carina arm.
897
- CHOE SEUNG-URN
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.445-449
- 1996
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We introduce the National Science Curriculum issued by the Education Ministry in Korea. Astronomy should be given and taught as compulsory courses in Nature of elementary school, Science of middle school, General Science of high school, and as elective courses in Earth Science I, II. Astronomy concepts have been designed in sprial pattern. College levels of astronomy have been given as majoring in astronomy course, cultivating one for earth science pre-teacher students and cultural subjects for non-major students
898
- SASAKI MINORU
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.85-86
- 1996
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The imaging spectroscopic observations of the Magellanic irregular galaxy NGC 4449 were made to show the detailed kinematic structure of the galaxy. Many filamentary structures and Several bubble-like structures are recognized in a 3D data cube of H<TEX>$\alpha$</TEX> emission line. Velocity field shows the kpc-scale mosaic structure and counter- rotation of ionized gas.
899
- LI XIAOMING
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.461-462
- 1996
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900
- KIM EUNHVEUK
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.81-82
- 1996
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